Honeywell 51401642-100 D I/O Link Interface CardDescription The Honeywell 51401642 100 is a Series C D I O Link Interface Card designed to manage high speed communication between the C300 controller and connected I O modules. It plays a critical role in distributed control system architecture. Specifications Model Number: 51401642 100 Component Type: D I O Link Interface Card System Compatibility: Honeywell C300 controller, Series C I O modules Communication Speed: 750 KBaud Link Ports: Supports